You have tested negative conclusively. Medical science in India is top class, India had access to HIV Duo test back in 2007, when most did not. You have no reason to doubt delayed seroconversion. You have overtested and tested negative through out. There is only one thing pending on your part - It is acceptance, accept it and put this behind you.
1) reliable
2) Hypogammaglobulinemia- absent of gamma globin. unable to produce ab.
Under strong immunosuppresant
Or else, The test would be reliable